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I have a 2011 Ram 2500 6.7 HO Cummins with the 68rfe tranny and RaceMe tuner, stock tranny and I have to get it up to 65 mph then drop down to 50 mph then it will sometimes shift into 5th and 6th and pull fine then next time I can't get it to go at all. NO CODES! Next time it works great and...